DS4 G
LOSSARY
G-1
G
LOSSARY
Acceleration
The change in velocity as a function of time.
Acceleration usually refers to increasing velocity and
deceleration describes decreasing velocity.
Ambient Temperature
The temperature of the cooling medium, usually air,
immediately surrounding the motor or another device.
Amplifier
Electronics which convert low level command signals
to high power voltages and currents to operate a servo
motor.
Brushless Servo Drive
A servo drive used to control a permanent magnet
synchronous AC motor. May also be referred to as an
AC Servo Drive.
Drive
This is the electronics portion of the system that
controls power to the motor.
Drive, Analog
Usually referring to any type of motor drive in which
the input is an analog signal.
Drive, Servo
A motor drive which utilizes internal feedback loops
for accurate control of motor current and/or velocity.
Efficiency
The ratio of output power to input power.
Encoder, Absolute
A digital position transducer in which the output is
representative of the absolute position of the input
shaft within one (or more) revolutions. Output is
usually a parallel digital word.
Encoder, Incremental
A position encoding device in which the output
represents incremental changes in position.
Encoder, Marker
A once-per-revolution signal provided by some
incremental encoders to specify a reference point
within that revolution. Also known as Zero
Reference signal or index pulse.
Encoder Resolution
A measure of the smallest positional change which
can be detected by the encoder.
Feedback
A signal which is transferred from the output back to
the input for use in a closed loop system.
Following Error
The position error during motion resulting from use
of a position control loop with proportional gain only.
Friction
A resistance to motion caused by surfaces rubbing
together. Friction can be constant with varying speed
(coulomb friction) or proportional to speed (viscous
friction) or present at rest (static friction).
Full Load Current
The armature current of a motor operated at its full
load torque and speed with rated voltage applied.
Full Load Speed
The speed of a motor operated with rated voltage and
full load torque.
Gain
The ratio of system output signal to system input
signal. The control loop parameter that determines
system performance characteristics.
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